Special cutter for machining small-diameter pore helical milling of composite material

Abstract

The invention discloses a special cutter for machining the small-diameter pore helical milling of a composite material. A first cutting edge, a second cutting edge and a third cutting edge are arranged on the cutting part of the cutter, and the included angles of the first cutting edge, the second cutting edge and the third cutting edge are different; the edge lengths of the three cutting edges are different; the back cutter faces of the three cutting edges are double back cutter faces with edge strips; the distances between the bottom edges of the three cutting edges and the center line of the cutter are different due to helical angles formed by the three cutting edges; the thickness of a milling cutter core is 70%-80% of the diameter of the cutter. The cutter comprehensively considers various problems of the geometrical shape of the cutter in helical milling machining of carbon fiber composite material small-diameter pores, the proportion of the thickness of the milling cutter core in the diameter of the cutter is improved, and the whole rigidity of the cutter is improved; by adopting the front angle of the cutter larger than an ordinary milling cutter, the cutting performance of the cutter for helical milling machining of the carbon fiber composite material is improved, the measures of reducing the back angle and the like are adopted, the strength of the small-diameter cutter cutting edge is improved, and the service life of the cutter is prolonged.

Description

technical field [0001] The invention relates to a special cutter for helical milling holes, in particular to a special cutter for helical milling holes of small-diameter composite materials. Background technique [0002] With the development of aerospace technology, the proportion of carbon fiber composite materials in aircraft components is increasing year by year. At present, in the assembly process of Chinese aircraft models, small-diameter holes account for a considerable proportion. However, the cutting process of carbon fiber composite materials is difficult, and it is easy to cause defects such as delamination, burrs, and tears. It is a typical difficult-to-machine material, especially for small holes on aircraft. [0003] Helical milling is a new type of hole-making technology. The helical milling process is formed by the joint action of three movements: spindle rotation, tool revolution around the center of the hole, and axial feed. However, the special tools for ...

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Problems solved by technology

[0005] The overall geometric design of the tool is not suitable for small-diameter holes in helical milling. When processing small-diameter holes in helical milling, it is necessary to fully consider the issues of chip removal, temperature and rigidity. The impact of chip removal is serious, and for small-diameter bars, it increases the difficulty of tool processing; secondly, because the tool diameter itself is required to be small, and the cutting speed required for processing carbon fiber composite materials is high, the required spindle speed will be Very high, this tool does not fully consider vibrations such as high-speed chatter during the helical milling process of the tool

Finally, this tool is designed for two materials: titanium alloy and carbon fiber composite material. The cutting performance of the two materials needs to be considered when designing the tool, and the effect of processing a single carbon fiber composite material is slightly worse.

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